Find minimum of single-variable function

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Mark S on 25 Jan 2021
Commented: Adam Danz on 26 Jan 2021
Hi, what expression is calculated by the following command in Matlab?
Code:
fminbnd(@(x) (sin(x).^2-1),0,pi)
Minimum of:
(a) f(x)=1-sin x^2 or (b)1-sin^2x.
I answered a) in my exercise, however I am not sure if this is correct. Can someone tell me if this is correct?
Mark S on 25 Jan 2021
Thank you for your help. I have answered a) in my exam, it would be nice if you can say if it's right or not. Because also with the link that you have mentioned i am not sure if my answer was right or not :/

Adam Danz on 25 Jan 2021
Hint:
[x,fval] = fminbnd(___)
gives you the (x,y) values at the minimum.
You could plug the x values into both of your options and the one that returns the matching y value is the correct function.
Adam Danz on 26 Jan 2021
Could you share the 2 lines of code where you tested the two versions? There's probably an error in how you're setting the equations.